Dear Aprilb, Nipple discharge is most often from benign (non-cancerous) conditions. Some women are more prone to more discharge including women on; birth control pills, certain blood pressure medications or on major tranquilizers. These medications increase prolactin levels in the body. There is also certain life periods when a person is more likely to get discharge than others: there may be more discharge at puberty and at menopause than the years in-between.
The time to worry about nipple discharge is when it’s spontaneous (comes out by itself without squeezing), keeps on happening, is only on one side, and/or if it is clear and sticky, like an egg white, or bloody. The usual recommendation is that if any of these symptoms are present you may want to be checked by your doctor. No one can say with absolute certainty given the information you describe that there is no need to be concerned, however breast cancer at your age is unusual. Your next step if this continues would be to have a sample of the fluid tested, you could discuss this with your doctor or perhaps seek an opinion of someone who specializes in breast care.